\documentclass{article}
\usepackage{pdfpages}
\includepdfset{fitpaper=true,pages=1-last,nup=3x3,frame=true}

\begin{document}
\includepdf{cover-red-dark.pdf}
\includepdf{cover-red-light.pdf}
\includepdf{cover-blue-dark.pdf}
\includepdf{cover-blue-light.pdf}
\end{document}
